v3.26.1
Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Net periodic (income) benefit cost for the Pension Plan, RIM Plan, Post-retirement Plan and Split-Dollar Life Insurance plan benefits for the three months ended March 31, 2026 and 2025, includes the following components:

 For the Three Months Ended March 31,
Pension PlanRIM PlanPost-retirement PlanSplit-Dollar Life Insurance
20262025202620252026202520262025 Affected Line Item in the Consolidated Statements of Income
(In thousands)
Service cost$887 $1,017 $44 $52 $50 $51 $47 $57 Compensation and employee benefits
Interest cost3,133 3,293 162 169 260 287 231 216 Other non-interest expense
Expected return on plan assets(9,508)(8,607)— — — — — — Other non-interest expense
Amortization:
Prior service cost— — — — — — 10 13 Other non-interest expense
Net loss— — — — — — — (22)Other non-interest expense
Net periodic (income) benefit cost$(5,488)$(4,297)$206 $221 $310 $338 $288 $264